I guess I'll take the downvotes and somewhat agree with them; probably not as far as to say a fireable matter for the first offense. Definitely a strong and unambiguous warning/disciplinary action (repeat offender, however? Fired)

Sorry, I get office pranks but there's no reason to be doing anything on an end-user's workstation without their permission or consent that isn't maintenance or security related. I guess I lack a sense of humor, but I've also seen too many instances where a prank on someone's machine resulted in severely unintended consequences and breaches of trust that rippled through the team.

Just not worth it, IMO.

Sure, getting fired for doing it the first time would definitely be a bit strong. However, an admin who was regularly using his remote management capabilities to play pranks I would hope would be let go.

We agree on this.